There are some classes of locomotive that were not from a specific or specified state.
Letter classed Locomotives
AL class
ALF class
AN class
BL class
BU class
CK class
CL class
CLF class
CLP class
DA class
DL class
EL class
FL class
GL class
GM class
HL class
JL class
KL class
NJ class
NSU class
NT class
NR class
NRE class
RL class
TL class
VL class
Number classed Locomotives
14 class
18 class
22 class
31 class
900 class
1200 class
1300 class
1600 class
6000 class
6020 class