I sent your photo to a lamp expert that I know. These are his objective comments, not mine.
The cast bases without markings could be generic that many lamp companies purchased rather than make their own.
The tank is most likely brass and may provide some clues. Be careful. The tank may be fitted to the base with plaster. A typical method used.
The burner did not look original. Rayo made burners for many lamp companies. The queen anne no.2 is a style. Check for a name on the wick knob.
Now, for the clues from the tank. Look carefully on the fill cap for a name. Sometimes, if you unscrew the burner from the tank, there may be a name around the inside of the lip.
It would have had a chimney originally, no shade.
Without any rr markings it is a vintage oil lamp. Before electric there were millions of them. This was a standard lamp. Not real expensive in it's day.
Searching historical societies and rr historical groups for an interior picture of the offices or stations, you may spot your lamp.
estimated value with no rr markings or photo tie in-$50 each. RR markings or photo tie-in depends on the collector, but in the hundreds.
Personal value because of the provenance, priceless. Put 'em in the train room. Thanks for the fun researching them and sharing your find!