Question: is the rer safe at night?
Answer: Re: Paris Metro - safe at night? Well, it's the RER, not the Metro - costs 9.50 euro each way, and I believe others will tell you that it's as safe at 9pm as other times as long as you stay wary about pickpockets. As a matter of fact, since it's past the rush hour, and probably less crowded, you may be safer.