A problem I have come across with modern digital voltmeters is the input resistance is so high, you can't see that there is a weak connection. A (say) 10 ohm resistance inserted between the transformer and the meter with 10,000,000 ohms won't be seen, but it will wreck havoc on the power delivered to an engine. I find a caboose or passenger car with one or more working incandescent light bulbs can solve that problem, or, use them together. Put the caboose at the furthest point from the transformer attachment and start measuring voltage along the way.
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