In 1.13 and below, you could use W to "push" a minecart you're riding forwards. On 1.14, however, trying to "push" off of unpowered golden rails onto normal rails doesn't work - the minecart gets "stuck" at the end of the powered rails and won't go any further, as if there's a solid object at the end of the row of unpowered golden rails where the rail is.