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- a cyclic code 1
- a departure yard 1
- a diesel engine - generator 1
- a diesel engine-generator 1
- a diesel locomotive 3
- a difference of width of a track 2
- a direct current engine 1
- a directed graph 1
- a dispersion 2
- a diversified company 1
- a dynamic study 1
- a dynamic video information resource 1
- a flame resistance 1
- a fleet of freight cars 1
- a flint artifact 1
- a frame 1
- a franchize 1
- a free-piston engine 1
- a functional component 1
- a gene 1