Updated at 6:51 a.m.

Good morning on this changeable Friday.

Gov. Andrew M. Cuomo has declared a state of emergency on the subway system to speed up purchases of equipment for much-needed repairs.

He has also pledged $1 billion in additional funding.

This comes a month after Mr. Cuomo announced the M.T.A. Genius Transit Challenge, a competition looking for innovative solutions to problems in three areas — modernizing subway cars, increasing communications infrastructure, and improving the signal system.

In other words, the city and state want your ideas — big or small, realistic or a bit out there.

So our New York Today team brainstormed to get the conversation started.

How to Modernize Subway Cars

• Use driverless trains;

• Install power outlets (lots of them);

• Unleash robotic cleaners on trains;