X37 Series Box Car Information for Modelers

In HO scale, the X37, X37A, and X37B box cars are available as resin kits from Funaro & Camerlengo. In addition to the decals in the kits, Mount Vernon Shops offers decals for the series. Kits were once offered by Sunshine Models, now out of business.

Interestingly, the three X37 sub-classes had different interior heights. The X37 was 10'4", the X37A 10'6", and the X37B 10'8".

Notes from http://www.steamerafreightcars.com...

The roof on all three subclasses are a lap seam design similar to that found on Class X29; however, the Class X37 roofs have six evenly spaced ribs with a closely spaced double row of rivets in between each set of ribs. Additionally, the end panels are depressed to accommodate the roof end walks. This isn't immediately apparent in builder's photos of PRR 65400, but it's obvious in an overhead shot and makes the cars easy to spot in yard photos. All cars (except for Class X37B 64400-65399 equipped with Alan Wood steel running boards) had wooden running boards when new.

The sides have 10 panels, but they have what is best described as an "alternating rivet pattern" (not ACRs). The rivets joining the panels alternate between wider and more narrowly spaced rows. The side ladders were similar to those on Class X29, with 6-rung ladders and a grab iron above two rung sill steps. This design feature was common to Class X23, X25, X29, and X37 families of cars.

All cars started out as general service cars, Class X37A and X37B Automobile cars were equipped with racks for auto parts service (AAR Car Classification XAP). A 1940 lettering diagram (updated to September 1951) records the following service assignments:

  • 7/12/40: Class X37B (226 cars), Ford Motor Co., Roofs, 1941 Model, RWE (Return When Empty) PRR Detroit
  • 4/30/41: Class X37B (34 cars), Ford Motor Co., Body Parts, RWE DT&I Detroit
  • 8/13/45: Class X37B (18 cars), American Viscose Corp., Rayon, RWE PRR Lewistown PA
  • 8/13/45: Class X37B (400 cars), Ford Motor Co., Ford Side Panels, RWE PRR Midvale, Philadelphia

Nothing recording RWE South Buffalo Rwy. Buffalo, NY, but auto parts loading from the Ford Motor Woodlawn stamping plant is certainly plausible given the above assignments.

None of cars ever received Evans Auto Loaders; however, the lettering diagram refers to another tracing detailing symbols for cars so equipped, so the Mechanical Department was obviously aware of the possibility of equipping these cars with Evans racks.

Additional References:

Fischer, Ian, "PRR Class X37 and X38 Box Cars", The Keystone, published by the Pennsylvania Railroad Technical & Historical Society, volume 14 number 4, Winter 1981.

Consoli, Jack, "Class X37B Boxcar", The Keystone Modeler, published by the Pennsylvania Railroad Technical & Historical Society, issue 62.

Types of Trucks Used:

ClassCarNumbersTruck ClassTruck NameQty cars
X37 65400 66299 2D-F19 P.R.R. 900
X37 66300 66399 2D-F20 National Malleable 100
X37     2D-F17a Elsey  
X37     2D-F19 P.R.R.  
X37A 66400 67299 2D-F20 National Malleable 900
X37A 67300 67399 2D-F21 Young 100
X37A     2D-F20 National Malleable  
X37B 64400 64699 2D-F22A Barrett-Whitehead 300
X37B 64700 64723 2D-F22B Barrett-Whitehead 24
X37B 64724 64799 2D-F21A Young 76
X37B 64800 65299 2D-F17A Elsey  500
X37B 65300 65398 2D-F24 Buckeye 99
X37B 65399   2D-F17A Elsey  1
X37B     2D-F17a Elsey  
X37B     2D-F20 National Malleable  
X37B     2D-F20 National Malleable  
X37B     2D-F21 Young  
X37B     2D-F22 Barrett-Whitehead  
X37B     2D-F23 Allied full cushion  

Truck data is from PRR documents circa 1940's. Other truck classes may also have been used.
Source: prr.railfan.net 

Cars on the PRR Roster (as listed in the Official Railway Equipment Register (ORER)):

ClassCarNumberAAR ClassPRR Oct 44PRR Oct 48PRR Apr 52PRR Oct 53PRR Oct 58PRR Oct 63PRR Apr 68
X37 65400 66399 XM XML XL 998 994 993 992 986 981 32
X37A 66400 66899 XAP XM XMP XP 500 499 497 497 493 490 90
X37B 64400 65399 XM XAP XP XMP 999 997 992 991 982 976 217
X37B 66900 67399 XAP XM XML XL XMP XP 499 498 493 493 492 488 99

Roster data compiled by Rich Orr
Source: prr.railfan.net

The X37

X37 65400 Side BillLane

From prr.railfan.net...

  • 40' Single door riveted steel boxcar
  • Built: 1939-1940 by the PRR
  • 5/5 dreadnaught ends
  • 10 panel sides (5 each side of door)
  • AAR shape side sill
  • 7' Doors w/ 19 corrugations
  • Wood roofwalk
  • 6 rung elevated ladders - grab iron for 7th bottom rung
  • X29-style lap panel roof w/ depressions for end walks
  • Some were equipped with rack for auto parts

A 1954 ORER lists all cars (65400-66399) as AAR class XM with the following exceptions:

Note L - Individual numbers of cars in series 48300 to 49299, 58100 to 58799, 58800 to 59449, 61102 to 62799, 65400 to 66399, 66900 to 67399, 73000 to 73499, 73699 to 76099 and 104260 to 107759 equipped with racks for hauling miscellaneous automobile parts. and differing in A. A. R. Mech. Designation from other cars in same series; A. A. R. Mech. Designation XML.

x37modelFunaro & Camerlengo X37 Model

The X37A

PRR X37A Box Car 66400 E12403 5 11 40 a x

From prr.railfan.net...

  • 40' Double Door steel boxcar
  • Built: 1940 by the PRR
  • 5/5 dreadnaught ends
  • 9 panel sides (4 to left, 5 to right of door)
  • Straight side sills
  • 12'6" door opening; 7 panel double doors (7' & 5'6")
  • Wood roofwalk
  • 6 rung elevated ladders - grab iron for 7th bottom rung
  • X29-style lap panel roof w/ depressions for end walks
  • Equipped with racks for automobile batteries and side panels

A 1954 ORER lists all cars (66400-66899) as AAR class XM with the following exceptions:

Note M - Individual numbers of cars in series 64400 to 65399, 66400 to 66899, 66900 to 67399, 563317 to 563886 and 59004 to 598433 equipped with double flooring and 24 inch steel places around inside of car for hauling coils of hot rolled steel and differing in A. A. R. Mech. Designation from other cars in same series; A. A. R. Mech. Designation XMP.

Note T - Individual numbers of cars in series 26501 to 31000, 64400 to 65399, 66400 to 66899, 66900 to 67399, 69000 to 69499 and 81100 to 81199 equipped with racks and hoists for hauling spools of rayon yarn on beams and differing in A. A. R. Mech. Designation from other cars in same series; A. A. R. Mech. Designation XMP.

Note EE - Individual numbers of cars in series 58100 to 58799, 64400 to 65399, 66400 to 66899, 66900 to 67399, 73699 to 76099, 84536 to 84825, 84826 to 85325 and 104260 to 107759 equipped with racks for hauling automobile side panels and differing in A. A. R. Mech. Designation from other cars in same series; A. A. R. Mech. Designation XAP.

Note FF - Individual numbers of cars in series 58100 to 58799, 64400 to 65399, 66400 to 66899, 66900 to 67399, 73699 to 76099 and 104260 to 107759 equipped with racks for hauling automobile roofs and differing in A. A. R. Mech. Designation from other cars in same series; A. A. R. Mech. Designation XAP.

Note QQ - Individual numbers of cars in series 58100 to 58799, 64400 to 65399, 66400 to 66899, 66900 to 67399, 73699 to 76099 and 84536 to 84825 equipped with racks for hauling automobile transmissions and differing in A. A. R. Mech. Designation from other cars in same series; A. A. R. Mech. Designation XAP.

x37amodelFunaro & Camerlengo X37A Model

The X37B

X37b lewistown

From prr.railfan.net...

  • 40' Double Door steel boxcar
  • Built 1940-41 by the PRR
  • 5/5 dreadnaught ends
  • 9 panel sides (4 to left, 5 to right of door)
  • Straight side sills from bolster to bolster
  • 12'6" double doors (7' & 5'6")
  • Wood roofwalk
  • 6 rung elevated ladders - grab iron for 7th bottom rung
  • X29-style lap panel roof w/ depressions for end walks
  • Equipped with racks for automobile side panels and transmissions

The first batch of cars (64400-65399) featured Youngstown doors and began arriving in 1940. The second batch (66900-67399) featured Superior doors and arrived in 1941. Contrary to the information provided above from prr.railfan.net, The Keystone Modeler indicates that the first 500 cars were built with 2D-F8 trucks and the last 1,000 with 2D-F12 trucks.

A 1954 ORER lists cars 64400-65399 as AAR class XM with the following exceptions:

Note M - Individual numbers of cars in series 64400 to 65399, 66400 to 66899, 66900 to 67399, 563317 to 563886 and 59004 to 598433 equipped with double flooring and 24 inch steel places around inside of car for hauling coils of hot rolled steel and differing in A. A. R. Mech. Designation from other cars in same series; A. A. R. Mech. Designation XMP.

Note T - Individual numbers of cars in series 26501 to 31000, 64400 to 65399, 66400 to 66899, 66900 to 67399, 69000 to 69499 and 81100 to 81199 equipped with racks and hoists for hauling spools of rayon yarn on beams and differing in A. A. R. Mech. Designation from other cars in same series; A. A. R. Mech. Designation XMP.

Note QQ - Individual numbers of cars in series 58100 to 58799, 64400 to 65399, 66400 to 66899, 66900 to 67399, 73699 to 76099 and 84536 to 84825 equipped with racks for hauling automobile transmissions and differing in A. A. R. Mech. Designation from other cars in same series; A. A. R. Mech. Designation XAP.

A 1954 ORER lists cars 66900-67399 as AAR class XM with the following exceptions:

Note L - Individual numbers of cars in series 48300 to 49299, 58100 to 58799, 58800 to 59449, 61102 to 62799, 65400 to 66399, 66900 to 67399, 73000 to 73499, 73699 to 76099 and 104260 to 107759 equipped with racks for hauling miscellaneous automobile parts. and differing in A. A. R. Mech. Designation from other cars in same series; A. A. R. Mech. Designation XML.

Note M - Individual numbers of cars in series 64400 to 65399, 66400 to 66899, 66900 to 67399, 563317 to 563886 and 59004 to 598433 equipped with double flooring and 24 inch steel places around inside of car for hauling coils of hot rolled steel and differing in A. A. R. Mech. Designation from other cars in same series; A. A. R. Mech. Designation XMP.

Note T - Individual numbers of cars in series 26501 to 31000, 64400 to 65399, 66400 to 66899, 66900 to 67399, 69000 to 69499 and 81100 to 81199 equipped with racks and hoists for hauling spools of rayon yarn on beams and differing in A. A. R. Mech. Designation from other cars in same series; A. A. R. Mech. Designation XMP.

Note EE - Individual numbers of cars in series 58100 to 58799, 64400 to 65399, 66400 to 66899, 66900 to 67399, 73699 to 76099, 84536 to 84825, 84826 to 85325 and 104260 to 107759 equipped with racks for hauling automobile side panels and differing in A. A. R. Mech. Designation from other cars in same series; A. A. R. Mech. Designation XAP.

Note FF - Individual numbers of cars in series 58100 to 58799, 64400 to 65399, 66400 to 66899, 66900 to 67399, 73699 to 76099 and 104260 to 107759 equipped with racks for hauling automobile roofs and differing in A. A. R. Mech. Designation from other cars in same series; A. A. R. Mech. Designation XAP.

Note QQ - Individual numbers of cars in series 58100 to 58799, 64400 to 65399, 66400 to 66899, 66900 to 67399, 73699 to 76099 and 84536 to 84825 equipped with racks for hauling automobile transmissions and differing in A. A. R. Mech. Designation from other cars in same series; A. A. R. Mech. Designation XAP.