James Brook wrote in message <38A2A26E.A4DECECC@ozemail.com.au>... <snip> The >only similarity between a 1700/1720 class loco and a flat top T is the fact they are >both hood units. And the fact they are both either models G8 or G18. G* = 8 cyl 567, G18 = 8 cyl 645. Barry Campbell