There are 78 episodes that aired from September 3rd, 1990 - October 30th, 1995.
Season 1 (1990)
- Beginnings (3 September 1990)
- Under The Bed (4 September 1990)
- Best Of Friends (5 September 1990)
- The Thing Outside (6 September 1990)
- Helpless (7 September 1990)
- Moving House (10 September 1990)
- Playing Games (11 September 1990)
- The Birthday Present (12 September 1990)
- Wind Chimes (13 September 1990)
- Sharing (14 September 1990)
- The Picnic (17 September 1990)
- Cleaning Day (18 September 1990)
Season 2 (1991)
- The Camping Trip (29 October 1991)
- Homeless (30 October 1991)
- Battle Of The Bed (31 October 1991)
- Secrets (1 November 1991)
- Blast Off (4 November 1991)
- A Case Of Trust (5 November 1991)
- The Concert (6 November 1991)
- Baby Of The Family (7 November 1991)
- Crying Wolf (8 November 1991)
- The Big Freeze (11 November 1991)
- Being Good (12 November 1991)
- The Birthday Party (13 November 1991)
- Operation Squeaky (14 November 1991)
- Buried Treasure (15 November 1991)
Season 3 (1994)
- Diesel Tries To Fly (29 August 1994)
- Dinosaur Tracks (30 August 1994)
- The Pink Thread (31 August 1994)
- Melissa's Dinosaur (1 September 1994)
- Diesel Who? (2 September 1994)
- The Homecoming (5 September 1994)
- The Three Little Pigs (6 September 1994)
- Disappearing Act (7 September 1994)
- Growing Up (8 September 1994)
- The Flood (9 September 1994)
- The Toy Orchestra (12 September 1994)
- The Money Box (13 September 1994)
- The Television Set (14 September 1994)
- The Toy Hospital (15 September 1994)
- A Trip To The Moon (16 September 1994)
- The Loose Tooth (19 September 1994)
- The Fancy Dress (20 September 1994)
- The Art Exhibition (21 September 1994)
- Finders Keepers (22 September 1994)
- Leaving Home (23 September 1994)
- Sock Soup (26 September 1994)
- The Train Conductor (27 September 1994)
- The Fun Run (28 September 1994)
- The Crying Baby (29 September 1994)
- Bringing Up Baby (29 September 1994)
- Going Away (30 September 1994)
Season 4 (1995)
- Left Behind (25 September 1995)
- All At Sea (26 September 1995)
- The Big Surprise (27 September 1995)
- Victoria Gets Swapped (28 September 1995)
- The Thinker (29 September 1995)
- Little Red Riding Hood (2 October 1995)
- The Telephone Exchange (3 October 1995)
- Putting Out The Rubbish (4 October 1995)
- The Birthday Balloon (5 October 1995)
- Traffic Lights (6 October 1995)
- Clowning Around (9 October 1995)
- The Hypnotist (10 October 1995)
- The Tin Star (11 October 1995)
- Three Billy Goats Gruff (12 October 1995)
- Shoe Laces (13 October 1995)
- Diesel's Taxi (16 October 1995)
- Evening News (17 October 1995)
- The Toy Bus (18 October 1995)
- Alfred and Alphonse (19 October 1995)
- The Ghost Train (20 October 1995)
- Chicken Pox (23 October 1995)
- The Elf (24 October 1995)
- Superbot (25 October 1995)
- The Christmas Tree (26 October 1995)
- Christmas Presents (27 October 1995)
- Happy New Year (30 October 1995)