On Friday, October 13, 2017 at 3:04:56 PM UTC-7, wrote:
On Friday, October 13, 2017 at 12:01:11 PM UTC-7, Doug Landau wrote:

Bombardier is Canadian not German.

Doug - I know that but the Rapid Transit car division is in Germany if memory is correct. In any case - BART has gone through 4 upgrades now and they ALL have the same problems as steam engines - solid axles.

Because trains run so seldom it requires half a century for the rails to wear enough to require replacing. Rapid transit systems have trains running mere minutes apart.

I tried to convince they when I worked for BART but they know what they're doing. Derailing vehicles.

I should add that I tried to convince them to use separate wheel bearings and motorize them all. This would allow for making auto-slip corrections and would stop the problem if a motor failure killing a line. And of course the wheel drag around corners would cease.

They have turns going into and in the middle of the trans-bay tube. The system has to be closed a couple of times a year for rail replacement.