Life is Like a Mountain Railroad is a classic gospel number you are likely to hear at any jam. Normally the breaks are split between players. The switch usually happens the measure after the A chord. Here we've got the whole break. This way you'll be ready if you take the first part, second part, or all parts! Don't be scared of those triplets. It's just a variation on timing with standard Scruggs licks. It's something Earl did often. Since you are using a combination of picking and left hand slur, it shouldn't be too tough. Isolate the licks and work on them slowly, or one measure at a time. It'll become second nature before you know it.