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The two Osprey titles on Armoured Units of the RCW - Red and White both have info on armoured trains as well as tanks and armoured cars Osprey has them on sale now
If you're not in a big hurry, Books Etc are selling that book for £6.28 inc p&p, against the Osprey RRP of £9.99. It usually takes about a week or two from order to delivery when I buy from them.