A man accused of locking 22 undocumented workers in a stifling boxcar during the weekend was jailed without bond Monday on alien smuggling charges.

The discovery of the 22 illegal aliens, some of whom had been locked in the boxcar up to two hours in temperatures of 99 degrees Sunday evening, averted a repeat of the 1987 tragedy at Sierra Blanca, Texas, where 17 men suffocated under similar circumstances, authorities said.