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<a href="https://ncedcc.zendesk.com/hc/en-us/articles/201479815-Step-1-The-Power-Cab">https://ncedcc.zendesk.com/hc/en-us/articles/201479815-Step-1-The-Power-Cab</a> The 1.65 manual on this page only mentions a 3amp powersupply being the max power supply that you can use.  I did not find those words in the manual. [quote user="gregc"]When should you get worried?  [/quote] Over 2amps, which is the stated capacity of the system. [quote user="gregc"]If heat is the problem, it would have been better if they added a temperature sensor.[/quote] If you were running 4 locomotives (HO) or 8 (N) per the manual above, you would never have heat problems.    Heat is generated by resistance.  Learn about Ohms law and Joule's first Law here: <a href="https://en.wikipedia.org/wiki/Joule_heating">https://en.wikipedia.org/wiki/Joule_heating</a> <a href="https://en.wikipedia.org/wiki/Ohm%27s_law">https://en.wikipedia.org/wiki/Ohm%27s_law</a> Overheating is only a problem when you exceed the rated capacity of the system.
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