MattW wrote:I think I had read sporadically on here problems with "mismatched" EMUs. For instance maybe a Silver Liner IV with a III in the consist. Generally speaking, what sort of problems can typically result from running different models/classes of EMUs together? Flat Spots?
Two question have to be answered:
1) Were the cars designed to operate in the same train?
If the answer is "No", the results of attempted operation may be blown fuses, circuit cards and other components. The offending equipment and anything coupled behind it will not operate. Cars ahead of the offending equipment may not operate properly either. The reason will be that the MU cables between the cars do not connect the same circuits, or may not even match.
If the answer is "Yes", we proceed to question 2
2) Are the operating characteristics of the cars compatible?
If the answer is "Yes" there should be no problems other than those encountered in normal operation of like cars.
If the answer is "No" then there will be problems at the couplers due to the differences in performance, but flat spots are unlikely unless the standard braking systems are not used.
The next stop is Washington. Change for Forest Hills Trains on the Winter St. Platform, and Everett Trains on the Summer St. Platform. This is an Ashmont train, change for Braintree at Columbia.