The decision to pay incentives and give away vast sections of land to build the Transcontinental Railroad was not made to provide jobs or just because the Government thought it'd be cool to have one, it was a strategic matter of moving California gold, Western cattle, and Great Plains wheat as well as getting free transportation for all Government purposes (That last one eventually ended). You'll notice the Government couldn't build that railway itself, but paid handsomely for two corporations who could build it from each end to do so.
And Joe Biden wouldn't know a good idea if it swam up to him and bit his leg off.