Hacker News
new
|
past
|
comments
|
ask
|
show
|
jobs
|
submit
login
fragmede
13 days ago
|
parent
|
context
|
favorite
| on:
Does that use a lot of energy?
Someone could graph the cost/benefit ratio on putting the batteries on the trains vs putting wires up everywhere.
help
Guidelines
|
FAQ
|
Lists
|
API
|
Security
|
Legal
|
Apply to YC
|
Contact
Search:
