Ottaw's O-Train system has two lines. Line 1 Confederation is the newest line in the system and has 34 Alstom Citadis Spirit LRVs, with more on the way for expansion. Line 2 Trillium is the original line, running 6 diesel DMU Alstom Coradia LINT 41 (replacing the older Bombardier Talent DMU).
Right now, the new Line 1 has periodic problems, to the point where 20 buses have been alloted as back-up.