HTI Toys, formerly known as Halsall, are a toy company based in the UK specialising in children's toys and prams and pushchairs. From 2006 to 2009, they manufactured three ranges of Underground Ernie toys.
The motorized trains were battery powered and consisted only of one unit - the train itself.
- Airport set
- Tunnel set
- Sheds set
- Bridge set
- Super-size interactive train set
The pullback trains were friction powered and consisted of two units - the train and passenger car.
Die-cast with sound
The die-cast with sound trains consisted of just the train, sound clips were played by pressing a button on top of the engine's cab. They were connected via magnets.