The good stuff
Will and Frank's efforts demonstrate teamwork and collaboration -- they must trust each other, even though at first they aren't very friendly. The movie also makes it clear that just because workers get old, that doesn't mean they're obsolete. Viewers will also see that what's best for the common good can be at odds with what's best for a particular company's business interests -- and the movie makes it clear that the right thing to do isn't always the easiest or most profitable.
Frank is smart, experienced, and confident in his skills. Connie, who seems to be the sole woman at a train yard full of men, is effective in her leadership position. Will puts the needs of his hometown above his own fear. Will and Frank learn to trust each other and work well together.
What to watch out for
A character dies in a train explosion, and throughout the film there's a pervasive dread that a group of kids on a field trip -- or the protagonists, or even an entire town -- will get killed/destroyed because of the runaway train. There are several stressful, intense scenes.
Frank's daughters, who work at Hooters, are shown sporting very short shorts and tank tops. Connie gives Frank a congratulatory kiss. Will and his wife kiss and embrace.
Language includes words like "s--t," "bi-ch," "ass," "a--hole," "p---y," "h--l," "d--n," "oh my God," "godd--n," and one use of "f--k," plus insults like "idiot," "stupid," and the like.
Prominent appearances by Ford trucks. Supporting characters work at Hooters.
Drinking, drugs, & smoking:
A character is shown smoking cigarettes; waitresses serve drinks, but no one really really drinks in the movie.