AA: Ann Arbor Railroad
ABR: Athens line
ACWR: Aberdeen Carolina and Western Railway
AERC: Albany and Eastern Railroad
AGR: Alabama and Gulf Coast Railway
AKDN: Acadiana Railway
AKMD: Arkansas Midland Railroad
AL: Almanor Railroad
ALM: Arkansas, Louisiana and Mississippi railroad
AM: Arkansas and Missouri Railroad
AN: AN Railway
ANR: Angelina and Neches River Railroad
APA: Apache Railway
AR: Aberdeen and Rockfish Railroad
ARA: Arcade and Attica Railroad
ARC: Alexander Railroad
ARZC: Arizona and California Railroad
ASRY: Ashland Railway
ATLT: AT&L Railroad
ATW: Atlantic and Western Railway
AWW: Algers Winslow and Western Railway
AZCR: Arizona Central Railroad
BAYL: Bay Line Railroad
BB: Buckingham Branch Railroad
BCLR: Bay Colony Railroad
BDRV: Belvidere and Delaware River Railway
BH: B&H Rail Corporation
BLOL: Bloomer Line
BLR: Blacklands railroad
BNR: Blackwell and Northern railway
BOP: Border Pacific Railroad
BXN: Bauxite and Northern Railway
CA: Chesapeake and Albemarle Railroad
CAGY: Columbus and Greenville Railway
CALA: Carolina Southern Railroad
CBRW: Columbia Basin Railroad
CBRY: Copper Basin Railway
CCKY: Chattooga and Chickamauga Railway
CCRR: Claremont Concord Railroad
CERA: Central Railroad of Indianapolis