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Ok, have taken another look inside the loco - the resistor bands are orange, 3 black, then brown (reading from the front of the loco to the back) which is apparently a 300 Ohm resistor - or 100 Ohms if I'm reading it backwards! Given "300" is printed on the circuit board next to it I'd guess it's a 300 Ohm resistor (printing presumably intended to help factory workers put the right value in). Thanks for all the help recieved!
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