I record this show for my dc. They LOVE it, only they call it "car crushers" ds (3 almost 4yo) named it that because the first one we saw (we bought a dvd. this was before we knew it was on tv) was the episode where they showed the car crusher.
Funny story:
About a week ago, I'm totally exhausted putting the dc to bed. dd (aug 09) says she wants to watch "car crushers" I start flipping through the recordings and am almost to the end when it dawns on me I'm looking for the title "car crushers" instead of "mighty machines"

Made it a lot easier to find after that.