Runic inscription:

Sigfast and Ärnfast they carve (the stone) for themselves

sikfastr : ok : ernfastr : þaiR : iuku : at : sik :
 

Year 1624
Johannes Bureus makes this drawing of the runestone and then Sigfast's S-rune is included, the one missing from the later drawing.

Year 1864
The rune slab is blown to pieces when the railway is built. A smaller piece of it is said to have been found in the railway wall, "opposite the pond in Karlbergs park" but has now disappeared again.

1905-1914
A few more pieces of the rune carving were found in an outbuilding at "Ingentings gård", but these too have now also disappeared.

The runecarver:

I think this is Ärnfast's second rune carving (or first) and he does it together with someone called Sigfast. Both have the surname -fast so they should be relatives, maybe even brothers.

Earnest future work as a rune carver will be carried out mainly in today's Ekerö municipality. The runic carving I guess is his first is U 52 in Edeby on Lovö which is also directly on the rock slab.

Links

Upplands Runinskrifter > Page 183
(Only in Swedish)

Runor >  Riksantikvarieämbetet

Google map > Find the place where the runic carving was

kalle@runristare.se
If you want to be of help or have a question.

Extra Runestones:

Ärnfast, his artwork outside Ekerö municipality

U 79 - Hässelby, by Ärnfast

U 123 - Karlberg, by Ärnfast

U 885 - Balingsta, by Ärnfast

Selected runestones that are also depicted in the Runestone park (Runstensparken)

Sö 141b - Aspa bridge with Svitjod

Sö 179 - Gripsholm, an Ingvar runestone

U 887 - Skillsta, one of the most beautiful

Vs 29 - Livsten's masterpiece at Sala