G  C  B7  D7

E|---3--0--2---2---|
B|---0--1--0---1---|
G|---0--0--2---2---|
D|---0--2--1---0---|
A|---2--3--2-------|
E|---3-------------|

Picking patterns for the song;

G:

E|----1----1---|
B|----0----0---|
G|----0----0---|
D|----0----0---|
A|----2--2-----|
E|--3--------3-|

C:

E|----0---0----0---0-----|
B|----1---1----1---1-----|
G|----0---0----0---0-----|
D|----2---2----2---2-----|
A|--3-----3--3-----3---3-|
E|------3--------3-------|

B7:

E|---2--2--|
B|---0--0--|
G|---2--2--|
D|---1--1--|
A|--2---0--|
E|-----2---|

D7:

E|--2--2----|
B|--1--1----|
G|--2--2----|
D|-0---0----|
A|----0-----|
E|----------|

If unsure of how to do this go to youtube and watch - Johnny Cash at Glastonbury (with song title) and see
how he does it. And if youre not using a capo then the chords are; A, D, C#7 and E

[Verse 1]
G      
Well if i don't wake up one morning and the rains pulled out and gone
C                                       G
If you are there or not. I may not even know
G                 B7        C                              G
Have a round and remember. Things we did that weren't so tender
G                      D7              G
Let the train blow the whistle when I go

WOO WOO

[Verse 2]
G   
On my guitar sell tickets. So someone can finally pick it
C                                             G
And tell the girls down at the Ritz. I said hello
G                       B7       C                     G
Tell the gossipers and liars. I will see them in the fire
G                      D7              G
Let the train blow the whistle when I go

[Chorus]
G        C                  G
Let her blow, O-oh let her blow
G                                          D7
Long and loud and hard and happy let her blow
        G          B7              C               G
No regrets, all my debts will be paid, when I get laid 
G                  D7                G
Let her blow, let her blow, let her blow


[Verse 3]
G    
You will be left without excuses. For the evils and abuses
C                                  G
Down to today from years and years ago
G                         B7            C               G
And have yourself another toke, from my basket full of smoke
G                          D7            G
And let the train blow the whistle when I go


[Chorus]
G        C                       G
Let her blow, O-oh Heyy let her blow
G                                          D7
Long and loud and hard and happy, let her blow
       G              B7          C                G
No regrets, all my debts will be paid, when I get laid
G                D7                  G 
Let her blow, let her blow, let her blow