For books involving the war against Japan, I would highly recommend
Quartered Safe Out Here: A Recollection of the War in Burma by George MacDonald Fraser:
http://www.amazon.com/Quartered-Safe...0984051&sr=1-1
And:
Tennozan: The Battle of Okinawa and the Atomic Bomb by George Feifer:
http://www.amazon.com/Tennozan-Battl...0983983&sr=1-1
Edit PS: A link for a website's armoured train bibliography which may prove useful if you were unaware of it previously:
http://www.aopt91.dsl.pipex.com/rail...redTrains.html
Some of the Schiffer books mentioned on it are available at Amazon.com, but I don't know if you'll have much luck at Chapters.