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In devtest v126.96.36.199, when first loading a vehicle, both boilers and steam pipes start pressurized. The boiler pressurization works fine (other than the limit being way too low), but the pipe pressurization has a couple issues that tend to instantly destroy steam engines.
First, the pipes start at the same pressure as the boiler, but they never get anywhere close to that pressure when the system is running unless there are many boilers and only one piston. That means that either the boilers have to start at a pressure much lower than needed so the pipes start at their normal pressure, or the engine has to be designed to not overspeed with far higher pressure than it will see in normal operation.
Second, the pipes are pressurized for each boiler on the system, not just once. On a system with 9 boilers that means the pipes start at 9 times the boiler pressure, or easily over 50 times the normal operating pipe pressure if the boilers start at their normal pressure. That's especially problematic since the limit of 10000 pressure basically requires a system to have many boilers so the engine can get enough pressure to run at full speed.