Here are my 20 favorite Thomas songs, ranked by myself.

Full ranking (besides Top 20):
21. Go, Go Thomas
22. James the Really Splendid Engine
23. The Locomotion
24. I Know How the Moon Must Feel
25. That’s What Friends Are For
26. Monsters Everywhere
27. Let’s Have a Race
28. We Make a Team Together
29. Troublesome Trucks
30. All You Need Are Friends
31. Come For the Ride
32. Searching Everywhere
33. Down By the Docks
34. Working Together
35. Best Friends Express
36. The Hottest Place in Town
37. The Whistle Song
38. It’s Great To Be an Engine
39. The Most Important Thing Is Being Friends
40. Night Train
41. Engine Roll Call (Seasons 19 – 21)
42. Hear the Engines Coming
43. Percy’s Seaside Trip
44. Determination
45. It’s Halloween
46. It’s Gonna Be a Great Day
47. All the Girls Around the World
48. Shining Time
49. I Want to Go Home
50. Gone Fishing
51. Somebody Has to Be the Favorite
52. Race with You
53. Who’s Thomas
54. There Once Was an Engine Who Ran Away
55. Our Tale of the Brave
56. Roll Along
57. The Sodor Construction Crew
58. Thomas and James Are Racing
59. Six Small Wheels
60. The Journey Never Ends
61. Summer Sunday
62. Wake Up
63. Blue Mountain Mystery
64. Don’t Stop
65. Together
66. Let’s Be Brave
67. Five New Engines In the Shed
68. Be Who You Are and Go Far
69. Donald’s Duck
70. The Red Balloon
71. It’s Christmas Time
72. Glynn’s Christmas Wish
73. Set Friendship in Motion
74. Winter Wonderland
75. Engine Roll Call
76. Party Train
77. Emily’s Song
78. Sir Topham Hatt’s Song
79. There’s A Job for Everyone
80. We Can’t Do Anything
81. Fall Is So Much Fun
82. Trying to Do Things Better
83. Sometimes You Make a Friend
84. Thomas and Percy
85. There’s Snow Place Like Home
86. Party Time
87. Where in the World Is Thomas
88. Ode to Gordon
89. Where, Oh Where Is Thomas
90. Day of the Diesels
91. Spring Is Here
92. The Steam Team
93. Responsibility
94. On a Journey Today
95. Surprises
96. One Friendly Family
97. Legend of the Lost Engine
98. We’re Friends
99. Hey, Hey Thomas
100. Every Day’s a Special Day on Sodor
101. Day and Night
102. Let’s Dream
103. Patience
104. Strength
105. Doing It Right
106. Let’s Go
107. Enda Ulale
108. The Narrow Gauge Engines
109. Togetherness
110. The Work Song
111. Pride
112. H Is for Harold
113. Brave
114. Navigation
115. Misty Island Rescue
116. Old and New
117. How Does It Work
118. Busy
119. Buffer Up and Share
120. Favorite Place
121. Sounds
122. A World Around You
123. The Dream Song
124. Big World! Big Adventures! Theme Song

Thomas and Friends is property of Mattel Creations.