The Little River RR
On a side note, I read, somewhere, that one of the reasons that you see steam trains with "helper diesels" is because the steam locomotives are not equipped with a full Positive Train Control system, which is pretty much a requirement for operating on the main lines. (But they can be equipped with a terminal that is linked to the diesel.)
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Odd double header mix a 040T (#1) tank and a 462(110 Pacific Type)
with tender.
PTC is most common on commuter rail systems and less so elsewhere,
as yet not all rail is required. Some smaller short lines, private trackage, historic rail often are exempt.
Helper diesel serves varied uses...
Interface to other than PTC signaling systems.
Emergency propulsion when the line in use cannot accept stoppages,
usually shared use or wide area track owner. Usually required for
lines that carry manifest loads.
Dynamic braking to reduce wear and tear on steam.
Hotel power for the passenger cars in use. Not all steam can
supply the power needs or correct format (AC/DC or voltages).
Typically for lighting, heating, or air conditioning.
Often its there as buffer.
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