Can You Help Identify These GeoTrax Pieces?

Three Mystery GeoTrax Pieces Evade Identification

I have the three GeoTrax items shown above - a fireman dressed mostly in yellow, a fire engine painted mostly white, and an ambulance disguised as a yellow taxi.

I haven't been able to determine which sets these originally belonged to. It's possible that the fireman and the fire engine were both part of the same set. There are no product IDs on either of them. The taxi is labeled L6374 on the bottom which is the identifier for the 2007 set called Ambulance with Stat and Stewart.

Do you own any of these pieces? If so, do you know for sure which sets they were originally part of? Having the original packaging would help a lot. I haven't found a box online that shows any of these.

Here are close-up shots of each of them.

If you have any information on any of these pieces, I would appreciate your letting me know. You can use this Contact Form or the comment section below to get in touch with me. I'll give a free copy of my GeoTrax Compendium and Checklist to the first person(s) who can positively identify each (that is, any one) of them.

Thanks!

UPDATE: After acquiring a total of 3 of the fire engines, I decided to try asking Fisher-Price about them. I'm not sure why I didn't think of this earlier. According to their information, the fire engine and fireman were a bonus that came with the Grand Central Station in 2007. The set was sold as M4686 exclusively at Walmart.

I think I'll ask next about the taxi and will update this if needed.