Longest Train in Minecraft? How many cars can we add before the server crashes?

Hello Engineers! We had a request from BNSF kid 7777 to do the world's longest train in Minecraft! Can you guess how many engines and cars?
We're building the longest freight train in the world in Minecraft today to see how many cars we can pull! We're using the Immersive Railroading Mod in Minecraft 1.12.2. We use a bunch of different rolling stock, like tanker cars, flatbeds and stock box cars. It gets so long that it starts crashing the server! Finally we get all the various trains and their cars connected together. As a final test, we try to pull all the cars up a very steep 12%+ grade up to our Sky Castle village...
ABOUT THE FUN ENGINEERS
Hey kids & parents! Welcome to The Fun Engineers family with Eric (7) Cody (4), Dr Dad and Super Mom! Spend some time with Cody and Eric and discover something fun and new in every episode! We created The Fun Engineers as we believe all kids can learn to be tomorrow's thinkers & entrepreneurs through creative play and fun problem solving experiments.
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