Multitrack > Track > Duplicate Selected Track - SHORTCUT

Not directly, but there's an easy way to do it, with one slight advantage:

Go tp Keyboard Shortcuts and assign a key (I use X) to be 'Select Clips to End of Track'. If you hit this on the track you've highligted, all the clips in it will be selected, in position. The go Ctrl+C and copy that. Put the cursor on your new track (you can even offst this if you want) and hit Ctrl+V. You're done. What's the advantage? You can put the cursor in as many tracks as you like, and paste these clips anywhere, as often as you like without making the selection again.