There is also an alternative P class model in Trainz already on the DLS in both original and late 90's Westrail liveries. They're really old models though so they may not work the best in TS19 and TANE, but they are an alternative til ATD's new version arrives. These are their KUIDs:
Westrail P class original version by Leon - KUID2:30073:1011:1
Westrail P class yellow livery version by Colhad KUID2:50587:1011:2
Plus modified versions by John_SB compatiable with TANE and TS19:
Original orange livery: KUID:60318:2006
Yellow livery: KUID:60318:2011
ARG orange and black livery: KUID:60318:2505 (This was their early 2000s post-privatisation ARG orange and black livery as the '2500 class' when Westrail's freight division was sold off by the WA state government to G&W and reclassified the ex-Westrail fleet into numbers based on their total tractive effort in HP)
It's great to see these beasts getting attention - they were the first Dash-8 specification locomotives built for narrow gauge in the world incidentally so they have definite historic merit in addition to being the workhorse for Westrail and it's successors for the past 3 decades now, and still have many years of service to go!