2015 COLORADO TRAILER WIRING DIAGRAM

Curt Echo Under-Dash Trailer Brake Controller - Bluetooth - 1 to 4
The Curt Echo Under-Dash Trailer Brake Controller item # C27JR needs the Curt Custom Wiring Adapter for Trailer Brake Controllers item # C51451 to work with your 2018 Chevy Silverado Z71. That is why it is a confirmed fit on the wiring adapter
Electrification of Caltrain - Wikipedia
The Caltrain Modernization Program (CalMod) is a $2 billion project that will add a positive train control (PTC) system and electrify the main line of the U.S. commuter railroad Caltrain, which serves cities in the San Francisco Peninsula and Silicon Valley, as well as transition from its current diesel-electric locomotive powered trains to electric multiple units (EMU).