Great photos Roger. You might also want to consider a spotlight. I purchased a 2.25 million candlepower hand-held spot from Home Depot for about $14. The camera is set to F8 @ 200 ISO (in RAW, in case I need to make minor adjustments later). I open the shutter in Bulb mode with a cable release and "paint" the locomotive with light. It takes a little practice, but it's faster and cheaper then buying multiple flashes.
Here are some examples from last year:
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Try it, you may like it!
Jeff Terry