Legislation to oppose the high-speed Texas Central Rail line between Houston and Dallas could cripple the future of all rail projects in the state of Texas, rail advocates say.

Proposals for high-speed rail have had a typically rough slog in Texas, with opposition from both landowners and airlines. This session, a handful of powerful lawmakers — many with rural constituents — have filed a slew of bills intended to constrain the privately financed high-speed rail project, which promises a 90-minute…