<p>If you’re simply metro-ing from the UMD station, you’ll get to Union Station faster. Shouldn’t be over 20-30 minutes. To get to New Carrollton, I believe you have to transfer at L’enfant to get on the orange line, and in total could be like 40-45 minutes (I could be slightly off as this is all from memory, but I believe that is the faster way to New Carrollton).</p>