Steam Trains From Great Britain and Beyond

I have a GP 9 Diesel Locomotive, Williams by Bachmann produces this power transformer size should I use? Start small to be safe, and move up until it seems to be running right. Unboxing Bachmann BR Blue Class 47 Diesel Locomotive hopfeed_template=”"; hopfeed_align=”LEFT”; hopfeed_type=”IFRAME”; hopfeed_affiliate_tid=”"; hopfeed_affiliate=”whp01202″; hopfeed_fill_slots=”true”; hopfeed_height=280; hopfeed_width=336; hopfeed_cellpadding=5; hopfeed_rows=20; hopfeed_cols=1; hopfeed_font=”Verdana, Arial, Helvetica, [...]