What significant obstacle related to existing infrastructure ultimately forced the withdrawal of Trevithick's Penydarren locomotive from service?

Answer

The engine was too heavy for the cast-iron plate tracks

The Penydarren railway used cast-iron plates, which were not designed to withstand the significant concentrated weight of the high-pressure steam engine, causing the plates to break.

What significant obstacle related to existing infrastructure ultimately forced the withdrawal of Trevithick's Penydarren locomotive from service?

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