Looks it starts on line 61, not 60.
data test;
infile 'https://www.itl.nist.gov/div898/strd/anova/SiRstvt.dat' url firstobs=61 truncover;
input i1-i5 ;
run;
Obs i1 i2 i3 i4 i5
1 196.305 196.304 196.130 196.280 196.212
2 196.124 196.383 196.201 196.175 196.105
3 196.189 196.167 196.289 196.149 196.185
4 196.257 196.326 196.034 196.149 196.005
5 196.340 196.042 196.181 195.989 196.209