Short Line Profiles Q-S
- Quincy Railroad Company QRR #656
- Rapid City, Pierre & Eastern RCPE #894
- Richmond Pacific Railroad Corporation RPRC #449
- Rock & Rail LLC RRRR #661
- Rogue Valley Terminal Railroad RVT #527
- Rio Valley Switching Company RVSC #713
- R.J. Corman Railroad Company/Texas Line, LLC RJCD #765
- Sabine River & Northern Railroad Company SRN #678
- Sacramento Valley Railroad SAV #679
- St. Maries River Railroad Company STMA #698
- St. Paul & Pacific Railroad Company SPP #379
- Salt Lake City Southern SL #809
- Salt Lake Garfield & Western Railway Company SLGW #690
- Sand Springs Railway Company SS #707
- San Antonio Central Railroad SAC #596
- San Diego and Imperial Valley Railroad Company SDIY #315
- San Francisco Bay Railroad Company SFB #543
- San Joaquin Valley Railroad Company SJVR #738
- San Luis Central Railroad Company SLC #696
- San Manuel Arizona Railroad Company SMA #794
- San Pedro Valley SPV #513
- Santa Cruz, Big Trees & Pacific Railway SCBG #914
- Santa Maria Valley Railroad Company SMV #741
- Santa Teresa Southern STS
- Savage Bingham & Garfield Railroad SBG #692
- SEMO Port Railroad, Inc. SE #788
- Sidney & Lowe Railroad, Inc. SLGG #731
- Sierra Northern Railway SERA #716
- South Chicago & Indiana Harbor Railway Company SCIH #557
- South Kansas & Oklahoma Railroad SKOL #701
- Southern Switching Company SSC #814
- Stillwater Central Railroad SLWC #797
- Stockton Terminal & Eastern Railroad STE #739
- Swan Ranch Railroad SRRR