>>1278552What would your alternative be? The N class locos have a top speed of 130 whereas VLocity DMUs can get up to 160. In terms of passenger comfort I'd say the two are rather comparable. The distances involved make it uneconomical for electrification of the whole line. In addition, VLos can be built locally at the Bombardier plant in Dandenong.
DMUs are perfectly serviceable elsewhere in the world and there's no reason an improved model of a proven train wouldn't be perfectly fine.