On Wed, 21 Dec 2011 10:36:04 -0800 (PST), harry
wrote:

Hello ****wit. The broken down bus disconnects his poles and all the
others can then pass. Breakdowns are very rare there is only one
moving part in the motor.

Rare is relative, I suppose. Sure, the majority of them ran night and
day quite reliably, but breakdowns did occur.