Ferry in 50s or 60s

I’m looking for someone who can explain this sketch in detail to me. Because I was hired to redo this illustration. This is said to be a ferry from the 1950s or 1960s. Details from the picture are as follows:

1. Gear or Machine
2. Cable
   The Ferry 3.
3. Cable + Pulley
4. River 6. Road

If anyone has any Google images or real photos, please post them here. Thanks.