Railway Track

Railway Track is an expert difficulty Premium Track (featured only as a regular track on iPod/iPhone). track in BTD4. The bloons come up from the top and eventually merge into one track at the bottom. There is water on either side of the track at the bottom for Monkey Buccaneers. This track is arguably one of the hardest in the BTD series because it has so many entrances and it is very difficult to secure them all. The center part of the track seems to be an ideal place to put Boomerang Throwers and Tack Shooters on. The track is also featured on Bloons Tower Defense 5 Deluxe as an Expert Track and is unlocked at Rank 29.

Trivia

 * The theme on BTD4 was completely dark green grass, while the theme on BTD5 Deluxe was completely lime green grass.
 * There is water at the sides of the track.
 * BTD4 has no trees while BTD5 Deluxe has 7 trees.
 * The rails on BTD4 is thick, while the rails on the BTD5 Deluxe version is thin, allowing more room for building monkeys.
 * The water on BTD4 is light blue, while on the BTD5 Deluxe version, the water is dark blue.