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Keystone Crossings has served 21395515 pages since June 1, 1997.
Very limited offerings these days.
Offers many hard to find decals, including the Missouri Pacific Eagle set used on passenger cars interchanged on the Pennsy's Penn Texas. Has issues with fulfillment; use with caution.
Shellscale offers decals for a number of roads, but notably for the Norfolk & Western passenger cars interchanged with the Pennsy.
John Frantz offers an excellent assortment of PRR decals. He also offers sets for Conrail, Western Maryland, and several other roads.