I made two wooden buses with two blocks of wood after seeing this article:

https://hackaday.io/page/7078-led-bus

I used bright LEDs from a USB solar charger kit that I received from China. There were a few missing parts (rechargeable battery, wires, tools) so I decided the use the parts for another purpose.

You can see how I connected the bright LEDs (Light Emitting Diodes) from the USB charger to the yellow wires. LEDs only conduct in one direction. If the LED is not turning on then you need to reverse the polarity.

The small wooden bus has a long hole drilled in the middle that I used for the yellow wire. I could not do the same for the bigger bus because my drill was not long enough.

The wheels are made from old solar night lights metal stands/tubes. I used a hack saw to cut the metal tubes.

I also used an old Soviet double room light switch. The power supply is 3 V, that can be realised with two AA/AAA/C or D batteries connected in series. There are 3 V buttons cells but I am not sure if those small batteries have sufficient current for those bright LEDs. A typical LED needs only 2 V and can burn if higher voltages are applied.

You can my electric sculpture working in this video:

From the video you can see the 30 year old Russian switch is not perfect. It is not a good idea to connect it to mains.