CarLaTeX
This MWE works:
```
\documentclass[twocolumn]{article}
\usepackage{tabularray}
\begin{document}
\begin{tblr}{colspec={Q[r,t]Q[c,m]Q[l,b]}, hlines}
{The baseline is\\ at the top\\ (right aligned)} &
{The baseline is\\ in the middle\\ (centered)} &
{The baseline is\\ at the bottom\\ (left aligned)}\\
\end{tblr}
\end{document}
```

If I change `article` into `ltugboat`, the first horizontal alignment is wrong:
```
\documentclass[final]{ltugboat}
\usepackage{tabularray}
\begin{document}
\begin{tblr}{colspec={Q[r,t]Q[c,m]Q[l,b]}, hlines}
{The baseline is\\ at the top\\ (right aligned)} &
{The baseline is\\ in the middle\\ (centered)} &
{The baseline is\\ at the bottom\\ (left aligned)}\\
\end{tblr}
\end{document}
```

Top Answer
samcarter
The problem seems to be that ltugboat.cls redefines `\raggedright` etc.
If one uses the original definitions from source2e, the alignment seems to work:
```
\documentclass[final]{ltugboat}
\usepackage{tabularray}
\makeatletter
\RenewDocumentCommand\TblrAlignRight{}{%
\let\\\@centercr
\rightskip\z@skip\leftskip\@flushglue
\finalhyphendemerits=\z@
\parindent\z@\parfillskip\z@skip}
\makeatother
\begin{document}
\begin{tblr}{colspec={Q[r,t]Q[c,m]Q[l,b]}, hlines}
{The baseline is\\ at the top\\ (right aligned)} &
{The baseline is\\ in the middle\\ (centered)} &
{The baseline is\\ at the bottom\\ (left aligned)}\\
\end{tblr}
\end{document}
```
