The story goes something like this.

The female lead rejected a rich suitor back in her Mexican village and ran away with her true love. To punish her for shaming them, her family cursed her with the dreaded Mayan Snake Curse which, as near as I can tell, means she will hatch snakes inside of her and they will devour her from within.  Except when they get out.  Her only hope is to find a shaman who can counter the Mayan curse, so she resolves to go where all Mayan shamans eventually go, Los Angeles. In fact, L.A. has an entire mini-city filled with them, kinda like a Mayan Shaman version of Chinatown. That's were Mel Gibson went to recruit the cast of Apocalypto. So the accursed one and her companion sneak across the border, and stow away on a westbound passenger train. Reptilarity ensues.

It's hard to supply any more detail because in order to do so I would have to pretend that this held my attention for long enough periods to make an impression. It didn't. In the early 1970s this would have been a third feature at a drive-in, probably ending about three in the morning. Too bad, really, because the concept had the potential to create a high camp romp, a sort of lower budgeted knock-off of its inspiration, Snakes on a Plane. But it isn't that. Not only is it altogether too serious, but long stretches of it are just plain boring ... just one-shots and two-shots of people sitting and talking on a faux train. One of the more interesting facets of the story is that the film's main characters are illegal Mexicans in the United States who start out unable to understand English, yet when they stow away with some gringos on the titular train for a few hours, they are soon speaking with a sophistication Norman Mailer would envy.

The filmmakers could only manage to come up with about ten snakes, probably from their gardens. You know the drill: Little garter snakes and ball pythons. In order to make the harmless little snakes seem scary, the sound guy added rattlesnake sounds for all of them. It didn't really help any.

When the film finally does get moving, with about three minutes left in the film, the little snakes morph into one gigantic snake big enough to swallow the entire passenger train. That would probably look dumb in a movie with a James Cameron budget, so you can't even imagine how silly it looks in this no-budgeter.  No problem. I'll show you:

Special effects by Lionel. Check out the bright green bushes on the hill.

After the train-eating scene, the final scene seems to show the giant snake ascending into heaven or something - featuring the snake's body double, which looks like a regular ol' fishing worm. Suddenly darkness becomes daylight and all the surviving humans just shrug their shoulders and walk away from the tracks while the credits roll.

Entertainment at its best.

I guess you won't be surprised to hear that it's rated a lowly 2.3 at IMDb, but that score actually gives an unfair picture. 

Unfairly inflated, that is! The top voters score it in the ones!