Post the errors you are getting here and perhaps we can help you get them fixed. I have both of them, and they both are Modified, so I may have also had to fix them, but I don't remember what was wrong.
Here is the Errors for both of them
(Reskin base 2)
; <kuid2:2512:2382:7> : Validating <kuid2:2512:2382:7>
! <kuid2:2512:2382:7> : VE48: This asset uses an obsolete trainz-build number. Trainz-build numbers below 3.5 are no longer supported.
; <NULL> : MeshResource::LoadResource> <NULL> | arc:fld:$(local)/hash-9E||kuid2 2512 2382 7.tzarc|
; <NULL> : Loading mesh body/body.im
- <kuid2:2512:2382:7> : VE170: Failed to open compiled texture 'body/horncover-horncover.texture' for 'arc:fld:$(local)/hash-9E||kuid2 2512 2382 7.tzarc|'
- <kuid2:2512:2382:7> : VE165: Texture 'body/horncover-horncover.texture' is missing or could not be loaded in mesh 'body/body.im', material '*body*6184E908*hc*m.onetex'.
! <kuid2:2512:2382:7> : VE217: Material *body*6184E908*hc*m.onetex in mesh file body/body.im has no texture assigned to a required slot: texture0
! <kuid2:2512:2382:7> : VE39: The texture 'attachments/offblack.tga' is a uniform color.
- <kuid2:2512:2382:7> : VE40: Unable to load primary image 'body/horncover.tga' for texture file 'body/horncover-horncover.texture.txt'.
! <kuid2:2512:2382:7> : VE39: The texture 'shadow/black.tga' is a uniform color.
! <kuid2:2512:2382:7> : VE146: An asset must be specified for tag 'texture-kuid'.
! <kuid2:2512:2382:7> : VE146: An asset must be specified for tag 'texture-kuid'.
! <kuid2:2512:2382:7> : VE146: An asset must be specified for tag 'texture-kuid'.
! <kuid2:2512:2382:7> : VE146: An asset must be specified for tag 'texture-kuid'.
! <kuid2:2512:2382:7> : VE146: An asset must be specified for tag 'texture-kuid'.
! <kuid2:2512:2382:7> : VE146: An asset must be specified for tag 'texture-kuid'.
! <kuid2:2512:2382:7> : VE146: An asset must be specified for tag 'texture-kuid'.
! <kuid2:2512:2382:7> : VE146: An asset must be specified for tag 'texture-kuid'.
! <kuid2:2512:2382:7> : VE109: The low-detail meshes total more than 500 polygons. This may have a negative impact on performance: 0: 11291
- <kuid2:2512:2382:7> : VE30: The tag 'image' in '0' refers to a nonexistent file: 'screenshot.jpg'.
(Smoothnose)
; <kuid2:2512:2385:1> : Validating <kuid2:2512:2385:1>
! <kuid2:2512:2385:1> : VE48: This asset uses an obsolete trainz-build number. Trainz-build numbers below 3.5 are no longer supported.
! <kuid2:2512:2385:1> : VE39: The texture 'attachments/offblack.tga' is a uniform color.
! <kuid2:2512:2385:1> : VE39: The texture 'shadow/black.tga' is a uniform color.
! <kuid2:2512:2385:1> : VE146: An asset must be specified for tag 'texture-kuid'.
! <kuid2:2512:2385:1> : VE146: An asset must be specified for tag 'texture-kuid'.
! <kuid2:2512:2385:1> : VE146: An asset must be specified for tag 'texture-kuid'.
! <kuid2:2512:2385:1> : VE146: An asset must be specified for tag 'texture-kuid'.
! <kuid2:2512:2385:1> : VE146: An asset must be specified for tag 'texture-kuid'.
! <kuid2:2512:2385:1> : VE146: An asset must be specified for tag 'texture-kuid'.
! <kuid2:2512:2385:1> : VE146: An asset must be specified for tag 'texture-kuid'.
! <kuid2:2512:2385:1> : VE146: An asset must be specified for tag 'texture-kuid'.
! <kuid2:2512:2385:1> : VE109: The low-detail meshes total more than 500 polygons. This may have a negative impact on performance: 0: 11085
- <kuid2:2512:2385:1> : VE30: The tag 'image' in '0' refers to a nonexistent file: 'screenshot.jpg'.